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Influence of alkoxy substituents on the exciton binding energy of conjugated polymers

被引：27
作者：
Rossi, L
Alvarado, SF
Riess, W
Schrader, S
Lidzey, DG
Bradley, DDC
机构：
[1] IBM Corp, Div Res, Zurich Res Lab, CH-8803 Ruschlikon, Zurich, Switzerland
[2] Univ Potsdam, Inst Phys, Dept Condensed Matter Phys, D-14469 Potsdam, Germany
[3] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England
来源：
SYNTHETIC METALS | 2000年 / 111卷
关键词：
conjugated polymers; excitons; scanning tunneling spectroscopy;
D O I：
10.1016/S0379-6779(99)00412-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Scanning tunneling microscope (STM) spectroscopy and optical absorption measurements were used to determine the exciton binding energy (E-b) of poly(p-phenylenevinylene) (PPV), We find E-b = 0.48 +/- 0.14 eV, which is significantly higher than the value of E-b reported previously for an alkoxy-PPV derivative. Furthermore, an analysis of photoluminescence (PL) and STM excited cathodoluminescence (CL) spectra, performed on PPV and on alkoxy-PPV derivatives, reveals that the energy separation between the dominant peaks in the vibronic progression is significantly smaller in the alkoxy-substituted compounds. The reduction of E-b appears to be related to the influence of the alkoxy side-chains, inducing a reduction of both the Coulomb interaction as well as the molecular structural relaxation energy of the exciton. (C) 2000 Elsevier Science S.A. All rights reserved.
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收藏
页码：527 / 530
页数：4
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